Apple has banned demos, and beta apps for the App store, saying;
“Your website is the best place to provide demos, trial versions, or betas of your software for customers to explore. The apps you submit to be reviewed for the Mac App Store should be fully functional, retail versions of your apps.”
Apple announced at its October 20th media event that the Mac App Store would debut for users of Mac OS X Snow Leopard within 90 days, meaning that a launch would be expected to occur by mid-January.